Rubbing suncream in 'cuts effect'

From a BBCnews.com article of the same title:

Rubbing sunscreen into the skin reduces its effectiveness, a study says... They measured the levels of tissue-damaging particles called free radicals after exposure and found they rose in direct relation to exposure to UVA rays, which is associated to cancer and premature ageing. They found that when the sunscreen was rubbed in it offered almost zero protection because the cream accumulated in lines and sweat glands and did not offer even protection... Sara Hiom, from the charity Cancer Research UK, said: "The one message people should take from this research is that you cannot rely on sunscreen alone to protect you from skin cancer. "Sunscreen should be the last - not the first - line of defence against the sun's harmful rays. "The most important thing is not to burn and we recommend that people should spend time in the shade between 11am and 3pm when the sun is at its height and they should cover up with a T-shirt, hat and sunglasses.